support crossentropy loss 3dim (#4875)
* support crossentropy loss 3dim
* merge conflict
Co-authored-by:
oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>
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* support crossentropy loss 3dim
* merge conflict
Co-authored-by:
oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>